Dentistry is always changing. GPs will always take on more and more procedures as your dental education makes us more prepared (yeah right), and the CE courses available tackle complex procedures. But, there is always going to be bigger and better technologies that the majority of GPs cannot afford (money or time invested to learn how), and will stay specialized. GPs chucking more wizzies? So what! OMFS is placing implants! GPs placing implants? SO WHAT!? OMFS growing real teeth yo.
Everything trickle downs. As techniques become more streamlined, it becomes easier for GPs to do. Even if everyone knows a general dentist who does most of his endo, or pulls thirds, or places implants, the majority of GPs still refer out and will always refer out.
Except perio. they are getting rid of that one.